【正确答案】正确答案： Dear Sir/Madam, I am writing to you concerning the quality problem of the mobile phone I bought from your store early last month. This mobile phone costs 2,000 yuan in your store. However, I regret to tell you that it broke down in less than a week. The microphone just did not work. The people I was calling could not hear me no matter how loudly I spoke. I returned it to your store for maintenance twice, but it still could not work properly. I therefore request that you replace it with a new one or give me a refund. I would appreciate it if you give me a prompt solution. Looking forward to hearing from you soon. Yours sincerely, Li Ming

【答案解析】解析： 题目要求写一封投诉信，投诉手机的质量问题。在阐述投诉理由及问题所带来的不便或损失时，表达要客观、得体，说清楚事情的始末，就事论事，不要对责任方的品格等进行评论。据此可谋篇布局如下： 第一段：说明写信理由，点明手机存在质量问题。 第二段：具体阐明质量问题，并提出解决问题的建议。 第三段：表达期待，并表示感谢。